How The Email List Was Built:

Solo Ads

Facebook Ads

PPV Traffic

Other PPC Traffic

Product Launches

The Single Most Effective List Building Strategy

In my humble opinion, that will be launching products in the niche that you are in. First of all, you will be building a list and is not just a list, is a buyer’s list which is more valuable than a freebie’s list. You will make money and at the same time, be able to generate a list of buyers in which you can turn around and sell more products to them later on. However, for a start, using free and paid traffic to build a freebie’s list or to simply to drive traffic to a salespage will be good.